A multiantenna multiuser broadcast channel with transmitter beamforming and user selection is considered. Different from the conventional works, we consider imperfect channel state information (CSI) which is a practical scenario for multiuser broadcast channels. We propose a robust regularized zero-forcing (RRZF) beamforming at the base station. Then we show that the RRZF outperforms zero-forcing (ZF) and regularized ZF (RZF) beamforming even as the number of users grows to infinity. Simulation results validate the advantage of the proposed robust RZF beamforming.
@article{arxiv.2003.09923,
title = {Regularized Zero-Forcing for Multiantenna Broadcast Channels with User Selection},
author = {Zijian Wang and Wen Chen},
journal= {arXiv preprint arXiv:2003.09923},
year = {2020}
}